wilson



un. s|7,3a2. E Patented Ian. I0. 1899.

n. H wuson. TELEPHONE SYSTEM.

(Application filed July so, 1897.) (No Mode l.) 2 sheets -shaetvl.

@M H1 M No. 6|7,382. Patented Ian; vl0, I899. D. H, WILSON;

TELEPHONE'SYSTEM. (Appliciztion filed July so, 1897.)

.2 Sheets-Sheet 2.

(No' Model.)

UNITED STATES PATENT OFFICE.

DAVID II. IVILSON, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE SUPERIOR ELECTRIC COMPANY, OF SAME PLACE.

TELEPHONE SYSTEM.

SPECIFICATION forming part of Letters Patent No. 617,382, dated January 10, 1899.

Application filed July 30, 1897. Serial No. 646,50'7J (No model.)

To all whom it may concern: I

Be it known that I, DAVID II. WVILSON, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Telephone Systems, of which the following is a specification.

Myinvention relates to telephones and telephone systems, and has for its object to pro-' vide a new and improved telephone system, of which the following is a description, reference being bad to the accompanying drawings, wherein Figure 1 is a perspective View of one form of telephone-box, showing the mechanism in position. Fig. 2 is a diagrammatic view showing the different circuits.

Like letters refer to like parts throughout both figures.

Fig. 1 shows an ordinary form of telephone-box with the instruments in position. The transformer or induction-coil used in this system is of a new and improved form, for which I have made application for Letters Patent of the United States, filed July 30, 1897, Serial No. 646,508, and consists of a primary coil A,provided with the core A, formed into opposed pole-pieces, between which the sec-. ondary coil A is movably supported, the core A of said secondary coil forming a part of the magnetic circuit of the primary coil. As illustrated in the drawings, I have shown the primary coil A as extending around the core A of the secondary coil. It is of course evident that this construction is not necessary; but when such construction is used the secondary coil and core may be rotated by the use of suitable contacts. Connected with the shaft A that supports the secondary coil, is a tubeor receptacle A, containing mercury and provided with the contact-points A A. (See Fig. 2.) A rod A is attached at one end to the arm A on the shaft A", the other end being fastened to the spring A Said spring A normally holds the core of the secondary coil in an angular position, as shown in Fig. 2. If the primary coil is energized when the core of the secondary coil is in this angular position, the magnetic forces acting upon said core will be unbalanced and said core and the mercury receptacle or tube A will be the position of the mercury therein, so as to make and break the contact between the mercury and the point A The spring then pulls the secondary coil and tube A back to their normal position, so as to again complete the circuit, and the operation above described is repeated. The induced current-in the secondary coil caused by the making and breaking of the circuit in the primary coil passes out on the main linein the usual manner. A call-bell B is located in the circuit of the secondary coil. The several circuit connections are made at the rear of the base-board B and are shown diagrammatically in Fig. 2. The lever C, which supports the receiver C, is pivoted at (J and is provided with the associated contact-springs C C and C and the insulated contact-blocks C and C The expansion-spring C moves the lever '0 upwardly when the receiver 0 is removed from its hook. The contact-spring O is connected to one pole of the primary coil by the wire C and to the contact-point A of the mercury-tube A by conductor C". The contact spring 0 is connected to the line C, which leads to the next station. This line-wire C is also connected to the lever C. The contact-sprin g C is connected with the switch D, provided with the insulated contact-plate D, which is connected by conductor D with the source of electric supply E. A conductor E leads from the source of electric supply to the primary coil A. Associated with the switch D are the contact-springs D D and D The contact-spring D is connected by conductor E with the contact-point A of the mercury-tube A, the contact-spring D by conductor E with the bell B, and the contact-' spring D by conductor E with the conductor G, which connects the receiver O with the secondary coil. The switchD is normally held against the contact-spring D by spring D. The contact-plate C on lever C is connected to the transmitter F, said transmitter being connected by conductor F with the conductor D which leads to the source of electric supply.

I have set out in the drawings a simple construction and have only attempted to show this construction diagrammatically, the object being to make the invention clear; but it is of course evident that the several parts herein shown may be greatly varied in form, construction, and arrangement without in any manner departing from the spirit of my invention, and I therefore do not wish to be limited in any particular to the construction shown.

I have only illustrated one set of instruments, as I consider one set sufficient to explain the operation of my system.

The use and operation of my invention as illustrated in the drawings are as follows: Vhen the circ uits are in the condition shown in Fig. 2 and it is desired to ring up the central station or any other station with which connection has been made, the switch D is moved away from the contact D and in contact with the contact-springs D andD The primary circuit will then be completed and will be traced as follows: from the source of electric supply E'by wire E to primary coil A, thence by conductors (J and (J to the mercury-tube, thence by contact A, conductor E contact D and conductor D back to the source of electric supply. The secondary coilA and mercury-tube A will now be moved or oscillated, as before referred to, and a pulsating current will be generated in the secondary coil, which will be traced as follows: from secondary coil A along conductors C and E to contact-spring D thence through switch D, contact-spring O lever O, and main line C to the bell or alarm of the connected station, and thence by ground to bell or alarm B, and thence back to the secondary coil A \Vhen the switch D is released, it returns to its former position with contactspring D. If now the receiver 0'' is taken from the lever O, the circuit through the transmitter and the receiver will be completed by the movement of the lever 0, due to the spring C and the circuit through the transmitter will be traced as follows: from the source of electric supply E to primary coil A, thence by conductor 0 and contacts G" and C to transmitter F, thence by conductors l3 and D back to the source of electric supply. It will be noticed that the circuit-breaking tube A is now cut out of circuit. If now the user talks into the transmitter F, which may be constructed in any desired manner, the resistance in the circuit of the primary coil will be varied so as to produce a variation in the current in the primary coil, and an undulating current is set fere with the operation of the device.

up in the secondary coil. Said undulating current passes through the receiver of the connected station and repeats the words spoken into the transmitter F. This circuit will be traced as follows: from the secondary coil to receiver 0, thence by contacts G and C and conductor 0 to the receiver of the connected station, thence to ground, and thence to bell B back to secondary coil. hen the receiver is hanging from the lever O, the bell is in condition to be rung by the connected station, the circuit being traced as follows: from connected station along line-wire C thence by lever 0, contacts 0'', switch D, contact D, and conductor E to the bell l3, thence to ground, and back to the connected station.

It will be seen that I use in this system the same induction-coil for producing the pulsating current that rings the bells and for producing the undulating current that actuates the diaphragm of the receiver at the distant station.

The coil which is interposed between the opposed pole-pieces may be so constructed as to remain stationary while the transmitter is being used; but in some instances I may arrange and adjust the circuits and parts so that this coil of the induction-coil will be responsive to the variations in the current produced when the transmitter is being used, said coil under these conditions being moved by this change in the current, so as to aid in varying the number of lines of force which thread the coil.

The construction of the induction -coil, wherein one of the coils is provided with opposed pole-pieces, the other coil being interposed between these opposed pole-pieces, so as to form part of the magnetic circuit of such coil, enables me to produce results that cannot be produced by the ordinary telephone system and apparatus. If the coil which is interposed between the opposed pole-pieces is movably mounted, it may be properly adj usted and the system of circuits so arranged that the said coil of the induction-coil is responsive to the variations in the current produced by the action of the transmitter when in use. This latter construction allows a movement of the interposed coil while the talking-circuit is being used and in some instances is advantageous in increasing the effectiveness of the apparatus. I have found that this movement of the coil does not inter- The movement of the movable coil is due to the fact that the forces acting on said coil are yaried when the current varies in response to the action of the transmitter, the coil being responsive to these variations, so as to produce the desired movement.

I claim 1. The combination in a telephone system of an induction-coil provided with a movable core, a circuit-breaker associated therewith and operated by the movement of said core,

IIO.

erases 3 a receiver, a transmitter, a signaling device, a system of circuits so arranged that the circuit-breaker is in circuit with the primary coil when the signaling device is operated and is cut out of circuit when the transmitter is being used.

2. The combination in a telephone system of an induction-coil having a secondary coil movably mounted in the magnetic circuit of the primary coil, a circuit-breaker connected to said secondary coil so as to be operated thereby, and consisting of a receptacle partially filled with a liquid-conductor and provided with contact-points so situated that the circuit can be broken by the movement of the receptacle, and a system of circuits so arranged that said receptacle can be cut in or out of circuit whereby the kind of, current generated by the secondary coil may be varied.

3. The combination in a telephone system of a transmitter, a receiver, a signaling device, and an induction-coil, said inductioncoil being provided with a secondary coil movably mounted in the magnetic circuit of the primary coil,a circuit-breaker connected with said secondary coil so as to be operated thereby, and consisting of a receptacle partially filled with a conductor and provided with contact-points so situated that the circuit can be broken by the movement of the receptacle, and a system of circuits so arranged that when said receiver is in circuit with the inductioncoil, the circuit-breaker is cut out of circuit, and when said receiver is out out of circuit, and the signaling device connected in circuit with the induction-coil, the circuit-breaker will also be in circuit with said induction-coil.

4. A telephone system comprising a receiver, a transmitter, a signaling device, an induction-coil or transformer provided with a primary coil having a core formed into opposed pole-pieces, a secondary coil interposed between said pole-pieces so that its core completes the magnetic circuit, and a system of circuits so arranged that said transformer will generate an alternating current when con- A nected in the signaling-circuit and will generate an undulating current when connected in the transmitter-circuit.

5. The combination in a telephone system of a transmitter, a receiver, an induction-coil comprising two coils, one movably mounted in the magnetic field of the other, and a system of circuits so arranged that the movable coil of the induction-coil is responsive to the variations in the current in the other coil when thetransmitter is being used.

6. A telephone system, comprising a transmitter, a receiver, an induction-coil comprising two coils, one movably mounted in the magnetic field of the other, the parts so adjusted that there is a movement of said movable coil while the transmitter is being used, the movement of said coil aiding in varying the number of lines of force that thread the coil.

7. A telephone system, comprising an induction-coil including a primary and a secondary coil, one coil provided with a core having opposed pole-pieces, the other coil interposed between said opposed pole-pieces, so as to be in the path of the magnetic circuit between such pole-pieces, and a trans 'mitterand receiver connected respectively with the primary and secondary coil of the induction-coil, so as to cooperate therewith.

8. A telephone system, comprising an induction-coil including a primary and a secondary coil, the primary coil being provided with a core having opposed pole-pieces, the secondary coil being provided with a core separate from the core of the primary coil but interposed between its opposed polepieces, so as to form part of the magnetic circuit thereof, a transmitter connected with said primary coil so as to cooperate therewith and a receiver connected with said secondary coil so as to be responsive to the transmitter when said transmitter is being used.

DAVID H. WILSON. Witnesses:

DONALD M. CARTER, HOMER L. KRAFT. 

